Temperatures in September
It's warm in September in London with an average temperature of 23°C. Temperatures this month range from a low of 18°C to a high of 26°C. At night, you can expect temperatures between 9°C and 15°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for London in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in London with warm temperatures, averaging around 25°C during the day and nights close to 15°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-September
By mid-September, the average daytime temperature drops to around 23°C, with nights close to 12°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of September
By the end of September, the average daytime temperature in London will be around 22°C, with nights close to 12°C. A shower might show up, but overall the weather will be dry and sunny.
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Precipitation in September
In September, there is an average of 77 mm of precipitation, spread over 8 days. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance is 27% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for London. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
London in September |
UK | ||
|---|---|---|---|
 Average Temperature |
23°C | 20°C | |
 High Temp |
26°C | 22°C | |
| Low Temp |
18°C | 17°C | |
 Total Precipitation |
77 mm | 44 mm | |
| Rainy Days |
8 days | 8 days | |
August
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit London?
Want nice weather? Then September is a great time to be in London. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for London in September
With 32°C, London hit the highest temperature in the last 10 years in September 2017. The lowest daytime temperature in this month was 12°C in 2018. The extreme night temperatures ranged from a low of 0°C to a high of 23°C.
Check out the climate of London for all months and discover the best travel time
Curious about the climate in other parts of Canada? Check out the weather and climate in places like Vancouver, Toronto, Niagara Falls, or have a look at other destinations in Canada.
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Daily Temperature in September in London
This chart shows the average daily temperatures, both day and night, for each day in September in London, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in London
The chart below shows the average daily precipitation in September for London, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 8 days of rain in London.
Daily UV Index in September in London
This chart shows the average daily UV index in September in London, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in London Over the Years
This chart shows the average temperature in September in London, measured in degrees Celsius, over the past years.
Total Precipitation in September in London Over the Years
This chart shows the average precipitation in September in London, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for London
Click on a specific day in September for detailed info on the typical weather on that day in London. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in London
Have you been to London in September?
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Average Weather in London by Month
Click on a month below to see detailed weather info for London. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
